if (isset($coldefs['primary'])  &&  $coldefs['primary_cols'] == 1) {
            $checked_str = $coldefs['pk_del'] == true ? ' checked' : '';
            $drop_element .= "                <td>\n"
                            .'                  <label><input type="checkbox" name="cd_def_pk_del_'.$idx.'"'.$checked_str.'> <b>'.$tb_strings['DropPK']."</b>\n</label>"
                            ."                </td>\n";